HEAD STACK ASSEMBLY PERCUSSION SWAGE PROCESSING MORPHOLOGIES FOR HARD DISK DRIVE PRODUCTSAuthors: Jeffry S. Bennin and Michael R. Tiller
Company: Hutchinson Technology Inc.
Date Published: 1/26/2010 Conference: Pan Pacific Symposium
The approach is not without its compromises, however, as an intricate balance of mechanical stiffness, minimized mass, and complex compressible features are designed into the baseplate component of the suspension assembly to attain both operational performance and processing objectives. Swage processing applies axial loads of 180 – 270N (40 – 60lbf), converted to compressive radial loads within the intricately patterned, ring-shaped boss tower, securely restraining the suspension assembly in a patterned hole in the E-block arm. High axial loads, however, can result in unfavorable deformation of the swage plate flange structure, with the potential to negatively impact head flight attitude. This paper will study the effects of impact or percussion swage processing as a means of transforming the power spectrum input to the system, reducing the axial force applied to the baseplate. Should impulse energy loading alter the static to dynamic friction states at the onset of compression swage, it may be possible significantly reduce the baseplate flange deformation and its associated impacts on flight attitude without deploying prohibitive lubricants, or significant modifications to established tooling and equipment infrastructure. Potential benefits may include future design and process modifications to minimize variation and further reduce feature complexity and resulting cost.
Keywords: Impact, Vibro-Impact, Percussion, Swage, Head Stack Assembly, HSA, Head Gimbal Assembly, HGA, Suspension Assembly, Hard Disk Drive, HDD, Baseplate, Swagebase, Dynamic Mass, Gram Load, Static Friction, Dynamic Friction.
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